Seiko Cal. 6694 - 638

The 6694-638 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6694 caliber with 35j jewels beating at 28,800 bph, it delivers a 71 hours power reserve. [seikata-wm-86fbf2f3757f]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

8.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Burgundy

Jewels

35j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1978

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